ENO2 and neoplasm: Serum tumor marker levels at diagnosis were carcinoembryonic antigen (CEA) 13.5 ng/ml; cytokeratin‐19 fragment (CYFRA) 4.9 ng/ml; progastrin‐releasing peptide (pro‐GRP) 63.5 pg/ml; and neuron‐specific enolase (NSE) 10.5 ng/ml.